基于单层线-圆极化转换聚焦超表面的宽带高增益圆极化天线设计

发布时间：2018-12-18 01:41

【摘要】：基于线-圆极化转换原理和聚焦超表面相关理论,设计了一种反射型宽带线-圆极化转换聚焦超表面,并结合线极化馈源设计了宽带的高增益圆极化天线.首先,提出了一种单层的变形十字超表面单元,单元具有极化独立特性,并且能够在10—14 GHz宽频带范围实现对反射波相位360?范围全调控,同时利用该单元构建的一维超单元很好地验证了奇异反射现象.然后,分别控制单元横向和纵向尺寸的分布构建出同时满足线-圆极化转换和聚焦条件的双功能超表面.最后,采用Vivaldi天线作为馈源对超表面进行照射组成天线系统,仿真及测试结果均表明天线系统同时实现了高增益和线-圆极化转换,系统的-1 d B带宽为24%,-3 d B轴比带宽为29.8%.本文的设计充分体现了超表面对电磁波相位和极化操控的灵活性,具有显著的应用前景.
[Abstract]:A wideband line-circular polarization focusing supersurface is designed based on the principle of line-circular polarization conversion and focusing supersurface correlation theory. A wideband high-gain circular polarization antenna is designed in combination with linear polarization feed. First of all, a single-layer deformable cross supersurface element is proposed. The element is polarization-independent and can realize the phase of reflection wave in 10-14 GHz wide band. At the same time, the one-dimensional hyperelement constructed by this unit can well verify the phenomenon of singular reflection. Then, the distribution of the transverse and longitudinal dimensions of the control units respectively is used to construct a dual functional supersurface which satisfies both the linear and circular polarization conversion and focusing conditions. Finally, the Vivaldi antenna is used as feed to irradiate the supersurface to form an antenna system. The simulation and test results show that the antenna system simultaneously achieves high gain and line-circular polarization conversion, and the bandwidth of the system is 24 dB. The bandwidth of-3 dB axis ratio is 29.8b. The design of this paper fully reflects the flexibility of the supersurface to the electromagnetic wave phase and polarization control, and has a significant application prospect.
【作者单位】：空军工程大学防空反导学院;
【基金】：国家自然科学基金(批准号:61372034)资助的课题~~
【分类号】：TN820

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